On Ubuntu 21.04 with the Wayland graphics system, it doesn't work

[ghost]

I have done and redone all the steps indicated but nothing happens. Everything stays the same, it doesn't invert the colors

[zoltanp]

Hi,
this tool does not work on Wayland, only on X11. It uses X11-specific functionality (more exactly: as far as I know xrandr is not available on Wayland, as its architecture is different from X11's.)

[ghost]

Ah ok, thank u very much Zoltan, I din’t know, thank you Da: Zoltan ***@***.***> Inviato: lunedì 18 ottobre 2021 22:55 A: ***@***.***> Cc: ***@***.***>; ***@***.***> Oggetto: Re: [zoltanp/xrandr-invert-colors] On Ubuntu 21.04 with the Wayland graphics system, it doesn't work (#24) Hi, this tool does not work on Wayland, only on X11. It uses X11-specific functionality (more exactly: as far as I know xrandr is not available on Wayland, as its architecture is different from X11's.) — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#24 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AOZKJNDAXYCLAJG77LQ225LUHSCSNANCNFSM5GCPEF3A>. Triage notifications on the go with GitHub Mobile for iOS<https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android<https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[koo5]

there seems to be a comparable api:
https://wayland.app/protocols/wlr-gamma-control-unstable-v1

[zoltanp]

Thanks, this looks like something usable for inverting colors on Wayland.

I've seen a few important details related to this API :

• " There can only be at most one gamma control object per output, which has exclusive access to this particular output. "
  • So at one point in time only one program can control the gamma. Not sure if the window manager / compositor counts here.
• zwlr_gamma_control_v1::destroy : " Destroys the gamma control object. If the object is still valid, this restores the original gamma tables. "
  • If the program controlling the gamma stops/exits, then the gamma value is restored. Thus the program controlling the gamma has to run as a background application / service.